html,body{
    height: 100%;
    margin: 0;
    padding: 0;
    //tap高亮 一般给透明即可
    -webkit-tap-highlight-color: transparent
}
ul,ol{
    list-style: none;
}
a{
    text-decoration: none;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
.clearfix::before,
.clearfix::after{
    content: '';
    display: block;
    line-height: 0;
    height: 0;
    clear: both;
    visibility: hidden;
}
.clearfix{
    // 移动端可以省略
    zoom: 1;
}